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【简答题】
土壤中有害元素的自然本底值是环境保护和环境科学的基本资料,是_____重要依据。
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皮皮学刷刷变学霸
举一反三
【单选题】According to the passage, tile American economy grows fast essentially because of
A.
the people's attitude towards work
B.
people's hard and careful work
C.
the role of the government
D.
the influence of the religion
【简答题】设全集U={a，b，c，d}，集合A={a，b}，B={b，c，d}，则（? U A）∪（? U B）=（ ）。
【单选题】We can conclude from the text that______.
A.
American cities are changing far the worse
B.
people have different views on American cities
C.
many people are now moving from American cities
D.
the population is decreasing in older American cities
【单选题】From the passage we can infer that ______.
A.
Lincoln was born in February
B.
the American people love Washington because he was honest
C.
Washington was buried near the capital
D.
cherry pie is a necessity for Washington's birthday
【单选题】设全集 U={a,b,c,d},集合A={a,c},B={b,c}, 则C U B∪A为 ( )
A.
{a,c,d}
B.
{a，b，d}
C.
{a，b，c}
D.
{b，c，d}
【简答题】设全集U={a，b，c，d，e}，集合A={a，b}，B={b，c，d}，则A∩C U B=______．
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